linux-kernel - [tip:perf/core] tracing/kprobe: Fix NULL pointer deref check

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Date:	Mon, 14 Feb 2011 13:52:21 GMT
From:	tip-bot for Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, hpa@...or.com,
	mingo@...hat.com, acme@...stprotocols.net, peterz@...radead.org,
	masami.hiramatsu.pt@...achi.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/core] tracing/kprobe: Fix NULL pointer deref check

Commit-ID:  0de4b34d466bae571b50f41c7296b85248205e35
Gitweb:     http://git.kernel.org/tip/0de4b34d466bae571b50f41c7296b85248205e35
Author:     Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
AuthorDate: Mon, 14 Feb 2011 14:48:07 +0900
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 14 Feb 2011 12:09:53 +0100

tracing/kprobe: Fix NULL pointer deref check

Add NULL check for avoiding NULL pointer deref.
This bug has been introduced by:

  1ff511e35ed8: tracing/kprobes: Add bitfield type

which causes a null pointer dereference bug when kprobe-tracer
parses an argument without type.

Reported-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: 2nddept-manager@....hitachi.co.jp
Cc: Peter Zijlstra <peterz@...radead.org>
LKML-Reference: <20110214054807.8919.69740.stgit@...236.sdl.hitachi.co.jp>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
Reported-by: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
---
 kernel/trace/trace_kprobe.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index ccdc542..8435b43 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -935,7 +935,7 @@ static int parse_probe_arg(char *arg, struct trace_probe *tp,
 	parg->offset = tp->size;
 	tp->size += parg->type->size;
 	ret = __parse_probe_arg(arg, parg->type, &parg->fetch, is_return);
-	if (ret >= 0)
+	if (ret >= 0 && t != NULL)
 		ret = __parse_bitfield_probe_arg(t, parg->type, &parg->fetch);
 	if (ret >= 0) {
 		parg->fetch_size.fn = get_fetch_size_function(parg->type,
--
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